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Flavor-singlet hidden charm pentaquark

机译:风味单一的隐藏魅力五夸克

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One type of hidden charm pentaquark P c s with quark content c c ˉ u d s in light-flavor singlet state is studied in the quark model. This state is analogous to the P c with c c ˉ u u d in light-flavor octet, which was observed in LHC in 2015. Considering various combinations of color, spin, and light flavor as internal quantum numbers in P c s , we investigate the mass ordering of the P c s ’s by adopting both the one-gluon exchange interaction and the instanton-induced interaction in the quark model. The most stable configuration of P c s is identified to be total spin 1 / 2 in which the c c ˉ is combined to be color octet and spin 1, while the u d s cluster is in a color octet state. The other color octet configurations, the total spin 1 / 2 state with the c c ˉ spin 0, and the state with total spin 3 / 2 and c c ˉ spin 1, are found as excited states. We also discuss possible decay modes of these hidden charm pentaquarks.
机译:在夸克模型中,研究了一种具有淡味单重态的夸克含量c cˉuds的隐藏式五角夸克P c s。此状态类似于浅味八位位组中带有cc ud的P c,这在LHC中于2015年观察到。考虑到颜色,自旋和浅色风味的各种组合作为P cs中的内部量子数,我们研究了质量序通过在夸克模型中同时采用单胶子交换相互作用和瞬子诱导相互作用来对P cs进行分析。 P c s的最稳定配置被确定为总自旋1/2,其中c cˉ组合为彩色八位位组和旋转1,而u d s簇处于彩色八位位组状态。其他颜色八位位组配置,即c cˉspin为0的总自旋1/2状态,以及c cˉspin 1为总自旋3/2的状态被发现为激发态。我们还将讨论这些隐藏的魅力五夸克的可能衰减模式。

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